Module:IsNum

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This module is rated as ready for general use. It has reached a mature form and is thought to be bug-free and ready for use wherever appropriate. To reduce server load and bad output, it should be improved by sandbox testing rather than repeated trial-and-error editing.

This module is subject to page protection. It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing.

{{#invoke:IsNum|isNumber}}

Checks if string is a number Usage:

{{#invoke:IsNum|isNumber|string}}

Parameters:

string

The string to test

Example {{#invoke:IsNum|isNumber|hello}} gives 0, while {{#invoke:IsNum|isNumber|-200e-5}} gives 1

Code

local str = {}

--[[ 
	check if string is a number
]]
function str.isNumber( frame )
	if (not frame.args[1]) or (not tonumber( frame.args[1] )) then 
		return 0 
	else 
		return 1 
	end
end

return str